mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-15 11:26:44 +07:00
3cc30d0726
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: Michael Ellerman <michael@ellerman.id.au> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
185 lines
4.9 KiB
C
185 lines
4.9 KiB
C
/*
|
|
* IO workarounds for PCI on Celleb/Cell platform
|
|
*
|
|
* (C) Copyright 2006-2007 TOSHIBA CORPORATION
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License along
|
|
* with this program; if not, write to the Free Software Foundation, Inc.,
|
|
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
|
|
*/
|
|
|
|
#undef DEBUG
|
|
|
|
#include <linux/kernel.h>
|
|
#include <linux/of_platform.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/io.h>
|
|
|
|
#include <asm/ppc-pci.h>
|
|
#include <asm/pci-bridge.h>
|
|
#include <asm/io-workarounds.h>
|
|
|
|
#define SPIDER_PCI_DISABLE_PREFETCH
|
|
|
|
struct spiderpci_iowa_private {
|
|
void __iomem *regs;
|
|
};
|
|
|
|
static void spiderpci_io_flush(struct iowa_bus *bus)
|
|
{
|
|
struct spiderpci_iowa_private *priv;
|
|
u32 val;
|
|
|
|
priv = bus->private;
|
|
val = in_be32(priv->regs + SPIDER_PCI_DUMMY_READ);
|
|
iosync();
|
|
}
|
|
|
|
#define SPIDER_PCI_MMIO_READ(name, ret) \
|
|
static ret spiderpci_##name(const PCI_IO_ADDR addr) \
|
|
{ \
|
|
ret val = __do_##name(addr); \
|
|
spiderpci_io_flush(iowa_mem_find_bus(addr)); \
|
|
return val; \
|
|
}
|
|
|
|
#define SPIDER_PCI_MMIO_READ_STR(name) \
|
|
static void spiderpci_##name(const PCI_IO_ADDR addr, void *buf, \
|
|
unsigned long count) \
|
|
{ \
|
|
__do_##name(addr, buf, count); \
|
|
spiderpci_io_flush(iowa_mem_find_bus(addr)); \
|
|
}
|
|
|
|
SPIDER_PCI_MMIO_READ(readb, u8)
|
|
SPIDER_PCI_MMIO_READ(readw, u16)
|
|
SPIDER_PCI_MMIO_READ(readl, u32)
|
|
SPIDER_PCI_MMIO_READ(readq, u64)
|
|
SPIDER_PCI_MMIO_READ(readw_be, u16)
|
|
SPIDER_PCI_MMIO_READ(readl_be, u32)
|
|
SPIDER_PCI_MMIO_READ(readq_be, u64)
|
|
SPIDER_PCI_MMIO_READ_STR(readsb)
|
|
SPIDER_PCI_MMIO_READ_STR(readsw)
|
|
SPIDER_PCI_MMIO_READ_STR(readsl)
|
|
|
|
static void spiderpci_memcpy_fromio(void *dest, const PCI_IO_ADDR src,
|
|
unsigned long n)
|
|
{
|
|
__do_memcpy_fromio(dest, src, n);
|
|
spiderpci_io_flush(iowa_mem_find_bus(src));
|
|
}
|
|
|
|
static int __init spiderpci_pci_setup_chip(struct pci_controller *phb,
|
|
void __iomem *regs)
|
|
{
|
|
void *dummy_page_va;
|
|
dma_addr_t dummy_page_da;
|
|
|
|
#ifdef SPIDER_PCI_DISABLE_PREFETCH
|
|
u32 val = in_be32(regs + SPIDER_PCI_VCI_CNTL_STAT);
|
|
pr_debug("SPIDER_IOWA:PVCI_Control_Status was 0x%08x\n", val);
|
|
out_be32(regs + SPIDER_PCI_VCI_CNTL_STAT, val | 0x8);
|
|
#endif /* SPIDER_PCI_DISABLE_PREFETCH */
|
|
|
|
/* setup dummy read */
|
|
/*
|
|
* On CellBlade, we can't know that which XDR memory is used by
|
|
* kmalloc() to allocate dummy_page_va.
|
|
* In order to imporve the performance, the XDR which is used to
|
|
* allocate dummy_page_va is the nearest the spider-pci.
|
|
* We have to select the CBE which is the nearest the spider-pci
|
|
* to allocate memory from the best XDR, but I don't know that
|
|
* how to do.
|
|
*
|
|
* Celleb does not have this problem, because it has only one XDR.
|
|
*/
|
|
dummy_page_va = kmalloc(PAGE_SIZE, GFP_KERNEL);
|
|
if (!dummy_page_va) {
|
|
pr_err("SPIDERPCI-IOWA:Alloc dummy_page_va failed.\n");
|
|
return -1;
|
|
}
|
|
|
|
dummy_page_da = dma_map_single(phb->parent, dummy_page_va,
|
|
PAGE_SIZE, DMA_FROM_DEVICE);
|
|
if (dma_mapping_error(phb->parent, dummy_page_da)) {
|
|
pr_err("SPIDER-IOWA:Map dummy page filed.\n");
|
|
kfree(dummy_page_va);
|
|
return -1;
|
|
}
|
|
|
|
out_be32(regs + SPIDER_PCI_DUMMY_READ_BASE, dummy_page_da);
|
|
|
|
return 0;
|
|
}
|
|
|
|
int __init spiderpci_iowa_init(struct iowa_bus *bus, void *data)
|
|
{
|
|
void __iomem *regs = NULL;
|
|
struct spiderpci_iowa_private *priv;
|
|
struct device_node *np = bus->phb->dn;
|
|
struct resource r;
|
|
unsigned long offset = (unsigned long)data;
|
|
|
|
pr_debug("SPIDERPCI-IOWA:Bus initialize for spider(%s)\n",
|
|
np->full_name);
|
|
|
|
priv = kzalloc(sizeof(struct spiderpci_iowa_private), GFP_KERNEL);
|
|
if (!priv) {
|
|
pr_err("SPIDERPCI-IOWA:"
|
|
"Can't allocate struct spiderpci_iowa_private");
|
|
return -1;
|
|
}
|
|
|
|
if (of_address_to_resource(np, 0, &r)) {
|
|
pr_err("SPIDERPCI-IOWA:Can't get resource.\n");
|
|
goto error;
|
|
}
|
|
|
|
regs = ioremap(r.start + offset, SPIDER_PCI_REG_SIZE);
|
|
if (!regs) {
|
|
pr_err("SPIDERPCI-IOWA:ioremap failed.\n");
|
|
goto error;
|
|
}
|
|
priv->regs = regs;
|
|
bus->private = priv;
|
|
|
|
if (spiderpci_pci_setup_chip(bus->phb, regs))
|
|
goto error;
|
|
|
|
return 0;
|
|
|
|
error:
|
|
kfree(priv);
|
|
bus->private = NULL;
|
|
|
|
if (regs)
|
|
iounmap(regs);
|
|
|
|
return -1;
|
|
}
|
|
|
|
struct ppc_pci_io spiderpci_ops = {
|
|
.readb = spiderpci_readb,
|
|
.readw = spiderpci_readw,
|
|
.readl = spiderpci_readl,
|
|
.readq = spiderpci_readq,
|
|
.readw_be = spiderpci_readw_be,
|
|
.readl_be = spiderpci_readl_be,
|
|
.readq_be = spiderpci_readq_be,
|
|
.readsb = spiderpci_readsb,
|
|
.readsw = spiderpci_readsw,
|
|
.readsl = spiderpci_readsl,
|
|
.memcpy_fromio = spiderpci_memcpy_fromio,
|
|
};
|
|
|